Overview
Measures light intensity at frequencies relevant to photosynthesis. HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or HOBO MicroRX station or transmit data via other wireless sensors to the central station. These sensors are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset's innovative cloud-based software platform.
Features
Sensor Features
- 0 to 2500 umol/m2/sec measurement range at wavelengths from 400 to 700 nm
- Encapsulated in an anodized aluminum housing with acrylic diffuser
Wireless Features
- 900 MHz wireless mesh self-healing technology
- Wireless range of 450 to 600 meters (1500 to 2000 feet) and up to five hops
- Up to 50 wireless sensors or 336 data channels per HOBO RX station
- One push of a button joins the HOBOnet wireless network
- Onboard memory to ensure no data is lost
- Powered by rechargeable AA batteries and built-in solar panel
Specifications
Sensor
Measuring range
0 to 2500 μmol/m2/sec, wavelengths 400 to 700 nm
Accuracy
±5 μmol/m2/sec or ±5%, whichever is greater under sunlight conditions; Additional temperature-induced error ±0.75 μmol/m2/sec/°C from 25 °C (0.42 μmol/m2/sec/°F from 77 °F)
Angular accuracy
Cosine corrected from 0 to 80 degrees from vertical; Azimuth Error <2% error at 45 degrees from vertical, 360 degree rotation
Resolution
2.5 μmol/m2/sec
Drift
<±2% per year
Wireless Mote
Operating Temperature Range
-25° to 60°C (-13° to 140°F) with rechargeable batteries
-40 to 70°C (-40 to 158°F) with lithium batteries
Radio Power
12.6 mW (+11 dBm) not adjustable
Transmission Range
Reliable line-of-sight connection from 457.2 m (1500 ft) at 1.8 m (6 ft) in height
Reliable line-of-sight connection from 609.6 m (2000 ft) at 3 m (10 ft) in height
Wireless Data Standard
IEEE 802.15.4
Radio Operating Frequencies
- RXW-LIA-900: 904-924 MHz
- RXW-LIA-868: 866.5 MHz
- RXW-LIA-922: 916-924 MHz
- RXW-LIA-921: 921 MHz
Modulation Used
OQPSK
Quadrature Phase Shift Keying with offset
Data Rate
Up to 250 kbps, not adjustable
Duty Cycle
<1%
Maximum Number of Motes
Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Logging Rate
1 minute to 18 hours
Number of Data Channels
2
Battery Type/Power Supply
Two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.2V AA NiMH rechargeable batteries, powered by
built-in solar panel 1.5V AA lithium for operating conditions of -40 to 70°C (-40 to 158°F)
Battery Life
With NiMH Batteries: Typically 3 to 5 years when used in a temperature range of -20° to 40°C (-4°F to 104°F) and facing the sun (see Deployment and Mounting); Operation outside this range will reduce battery life With lithium batteries: 1 year, typical use
Memory
16 MB
Dimensions
Sensor: 4.1 cm high x 3.2 cm diameter (1.61 x 1.26 in)
Cable length: 2 m (6.56 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 in)
Weight
Sensor and cable: 109 g (3.85 oz)
Mote: 223 g (7.87 oz)
Materials
Sensor: Anodized aluminum housing with acrylic diffuser and O-ring seal
Mote: PCPBT, silicone rubber seal
Environmental rating
Sensor: Weatherproof
Protection: IP67, NEMA 6
